This is a great concern to me as I use a custom menu and a set partition table. I can boot to any partition that I install to as there is a menu entry for that partition already in place.
If I have to boot to the new install I get the generated menu. Seeing how os-prober generates an entry for every custom entry on every partition the menu is a little large, over 100 entries. 11 of them work.
It is a lot easier to not install grub, boot to the new install and set up grub there.
As it is I need to set up grub through nautilus as root and then chroot in to update-grub or, alternately, chroot to another OS and run grub-install.
This is a great concern to me as I use a custom menu and a set partition table. I can boot to any partition that I install to as there is a menu entry for that partition already in place.
If I have to boot to the new install I get the generated menu. Seeing how os-prober generates an entry for every custom entry on every partition the menu is a little large, over 100 entries. 11 of them work.
It is a lot easier to not install grub, boot to the new install and set up grub there.
As it is I need to set up grub through nautilus as root and then chroot in to update-grub or, alternately, chroot to another OS and run grub-install.